Pump



March 10, 1942.

R. K. WILLIAMS PUMP Filed April 11, 1941 2 Sheets-Sheet l ATTORNEYS March 10, 1942. R. K. WILLIAMS 2,276,133

PUMP

Filed April 11, 1941 2 Sheets-Sheet 2 7" V Z5 Kgg I 6/ INVENTOR ATTORNEYS v Patented Mar. 10, 1942 UNITED STATES PATENT OFFICE PUMP Ritchie K. Williams, Roanoke, Va.

Application April 11, 1941, Serial No. 388,157

Claims.

This invention relates to improvements in pumps and especially is concerned with a novel pump useful in delivering a uniform nonpulsating flow of fluid.

It is a particular object of this invention to provide a novel pump comprising a plurality of coacting pumping units discharging fluid into a common outlet, the units coacting in a manner such that the dischcarged fluid is delivered at a substantially uniform pressure without pulsation as contrasted to presently used types of pumps, particularly those of the reciprocating type which can be characterized by nonuniformity of discharge.

A further object of this invention is to provide a novel pump structure which can be easily adapted to specialized uses such as delivery of measured quantities of fluid, pulsating delivery or delivery at a non-uniform rate, these modifications bein provided merely by changes in the operating cam.

An important advantage of the novel type of pump construction according to this invention facilitating smooth operation of the device without likelihood of binding at the coupling of the reciprocating pump member and the reciprocated drive member is the provision of substantially universally movable joining members at the place of coupling.

Noteworthy among the features of the novel pump according to the present invention are its simplicity and ruggedness of construction, the former suiting the device to the requirements of manufacture under conditions of mass production and the latter assuring long useful life.

Other objeccts, advantages and features of the new and improved pump according to the present invention will be apparent to those skilled in this art during the course of the following description.

Regarded in certain of its broader aspects the novel pump according to the present invention comprises a casing within which a rotating plug is mounted, the plug being closely fitted within the casing and being provided with a lurality of reciprocating pumping units having inletand outlet openings registerable during rotation of the plug with inlet and outlet openings formed in the casing and a cam system on one end of the casing for reciprocating the pumping units during rotation of the plug.

In order to facilitate a fuller and more complete understanding of the present invention a specific embodiment thereof herein illustrated will be hereinafter described, it being clearly understood, however, that the illustrated embodiment,

although presently preferrred, is provided solely by way of example of the practice of this invention and not by way of limitation thereof except insofar as the invention is recited in the subjoined claims.

Referring then to the drawings,

Fig. 1 is substantially a vertical sectional view of the presently preferred embodiment of this invention,

Figs. 2, 3 and 4 are transverse vertical sectional views of the device illustrated in Fig. 1 taken along planes indicated by the lines 2-2, 3-3 and 44 respectively,

Fig. 5 is substantially a developed view illustrating the relationship between the cams, pumping units and the hemi-annular channels in the casing,

Fig. 6 is substantially an elevational View of one of the reciprocating pumping members, and

Fig. 7 is a detail sectional view of the device illustrated in Fig. 2 taken along the line 'l-'I thereof. 7

The herein illustrated preferred embodiment of this invention generally designated by the reference character ill in the accompanying drawings comprises, it will be noted, a cylindrical axially bored casing ll having diametrically located inlet and outlet ports l2 and I3 respectively formed in the sides thereof Hemi-annular channels 14 and l 5 extending ina common plane from the inlet and outlet ports l2 and 13 respectively are formed in the bored interior of the casing I] for purposes which hereinafter will be described. The plug l6, closely fitted within the bored interior of the casing ll, abuts at one end against a plate I! attached to the casing end through an opening in which projects a stud shaft lBa carrying a driving gear IGb. A series of chambers l8, I9, and 2| provided with radially extending ports 22, 2 3, 24 and 25 registerable with the hemi-annular channels I4 and [5 are formed in the plug l6 and communicate directly with bores wherein are mounted sliding pumping members 26, 21, 28 and 29 respectively.

The plungers 26, 21, 28 and 29 are provided with split heads 30, 3!, 32- and 33 within which are mounted spherical bushings 34, 35, 36 and 31. Each of these bushings is substantially the same as each other and for convenience a typical bushing is illustrated in Fig. 6. It will be noticed that the bushing 34 has a contour substantially similar to a zone of a sphere and,

being received in an opening in the head having similar contour, provides a universal coupling for whatever is connected to the bushing.

A plurality of studs 49, 4|, 42 and 43 mounted upon blocks, two of which are designated by the reference characters 44 and 45, are freely slidably mounted in dovetail slots, two of which are designated by the reference characters 46 and 47, formed in an extension 48 of the plug l6 substantially as shown. These studs are received in and project through the openings in the annular spherical bushings 34, 35, 36 and 31 hereinabove described and the parts are assembled in a manner such that the studs and the blocks upon which'they are carried may be freely reciprocated with corresponding reciprocation plungers 26, 21, 28 and 29. To facilitate holding the bushings upon the studs, pins 49, 50, and 52 are provided with and extend diametrically through the bushings and the corresponding studs.

A head generally designated by the reference character 53 comprising a pair of hemi-annular members 54 and 55 connected at their flanged ends by bolts 56 is mounted upon slotted flanges 51 and 58 by bolts 59 in a manner such that limited rotation of the head about an axis common to the axis of bore of the casing H is permitted. A pair of internal continuous cam ways 60 and 6| are provided on the interior surface of the head 53 and receive the studs 49-42 and 4|43 respectively. The cam ways are parallel to each other throughout their length substantially as is illustrated in the developed view of Fig. 5. The cams serve to reciprocate laterally the studs carried on the sliding blocks received in the dovetail slots in the extension 48 of the plug l6 whereby the plungers 26, 21, 28 and 29 are at spaced intervals reciprocated during rotation of the plug. A plate 63 mounted upon the head 53 by bolts 64 serves to close the head and protect the operating mechanism.

In operation the plug I6 is rotated Within the casing I by connection of the gear |6b with appropriate driving means. As the plug rotates the ports 22, 23, 24 and 25 are successively moved from communication with the inletopening |2 through the channel M to communication with the outlet opening l3 through the channel l5 and simultaneously the plungers 2B, 21, 28 and 29 are reciprocated in a manner such that fluid is withdrawn from the channel l4, retained for a time interval ocrresponding to passage of the port past the portion ll of the casing H and discharged into the channel |5. As will be evident from Fig, 5, the cam ways 60 and 6| provide a pumping stroke as the studs travel along the portions 59a and 6| a of said cam ways during which time the ports 22 and 25 are in communication with the channel I5 and in like manner an intake stroke is provided by the portions 6% and (ill) of the cam ways. The intake and the pumping strokes are separated by a dormant interval corresponding to travel of the studs across the portions 69c and Glc of the cam ways during which no movement of the plungers takes place. It will be apparent that the cams may be adjusted by rotation of the head 53 within the limits permitted by the slotted flanges 51 and 58 and that when adjusted the head may be retained in position by tightening of the bolts 59. These intervals of nonmovement of the plungers correspond of course to passage of the corresponding ports passed in portions II and H" of the casing during rotation of the plug l6.

As shown to advantage at Figures 2, 3 and 4 of the illustrated example of the invention, the

longitudinal chambers I8 to 2| in the plug, which receive the plungers 26 to 29, are arranged in diametrically opposed pairs at uniform radial positions with respect to the plug axis but are not evenly spaced from one another. Thus, the angle between chambers I8 and I9 is less than the angle between chambers l9 and 20 while the angle between chambers 20 and 2| is smaller than that between .chambers 2| and I8. Although such an arrangement may be advantageous under certain circumstances to effect smoother pumping action with reference to the retaining intervals afforded by the bridge portions ll of the casing, the structure may be varied to suit particular needs. For instance, in some forms of the pump, especially in relatively large units, the chambers may advantageously be disposed at equal ninety degree angular positions.

It is to be understood that this invention is capable of extended application and is not confined to the precise illustrated forms nor described construction and, therefore, such changes and modifications may be made therein as do not affect the spirit of the invention nor exceed the scope of the appended claims.

Having thus described the present invention, what it is desired to secure by Letters Patent is:

1. A pump comprising a cylindrical axially bored casing having diametrically located inlet and outlet ports and hemi-annular channels formed in the bore of the casing communicating with said ports; a close-fitting plug rotatably mounted within the casing having pumping chambers formed therein communicating successively during rotation of the plug with the channel opening to the inlet port, and the channel opening to the outlet port; pump pistons within said chambers slidably mounted in the plug; and means for moving successively each of said pistons when the corresponding chamber is in communication with one of the hemi-annular channels comprising a plurality of cam riders, one slidably mounted near and operatively coupled to each of said pistons, and a head for the casing having internal cam-ways formed therein for engaging with and reciprocating the cam riders during rotation of the plug.

2. A pump comprising a cylindrical axially bored casing having diametrically opposed inlet and outlet ports formed in the casing communicating with hemi-annular channels formed circumferentially in the casing, a plug rotatably mounted within the casing having a plurality of axially extending pumping chambers disposed to successively communicate with the respective channels, a plurality of pistons slidably mounted in the said chambers, a reduced extension on the outer end of the plug having axially directed slots formed therein, a plurality of radial studs having their inner ends mounted to slide in the said slots and their outer ends. projecting outwardly thereof, means operatively connecting the inner ends of the pistons with the said studs, and an annular head mounted at one end of the casing concentrically with the extension of the plug, having continuous camways formed therein to receive the projecting ends of the studs to reciprocate the studs and pistons during rotation of the plug.

3. In a pump, a casing having inlet and outlet ports, a plug rotatably mounted within the casing having a plurality of axially extending pumping chambers adapted to successively communicate with the said ports, a plurality of pistons slidably mounted in the said pumping chambers,

an annular head mounted at one end of the easing having a pair of axially spaced camways formed therein the said reduced plug extension having a plurality of axially arranged dovetail slots therein, a plurality of studs slidably mounted in the said slots and projecting radially therefrom to engage the said camways, and spherical bushings fastened on the said studs and fitted within end portions of the piston to connect the pistons with the studs.

4. A pump comprising a cylindrical axially bored casing having diametrically opposed inlet and outlet ports communicating with hemi-annular channels formed circumferentially therein, a plug rotatably mounted Within the casing having a plurality of axially extending pumping chambers disposed to successively communicate with the respective channels, a plurality of pistons slidably mounted in the said chambers, a reduced extension formed on the outer end of the plug having axially directed slots formed there-' on, a plurality of radial studs slidably mounted in the said slots, means operatively connecting the inner ends of the pistons with, the said studs, an annular head mounted at one end of the easing concentrically with the extension of the plug, the said head having continuous camways formed therein receiving the outer ends of the studs for reciprocating the latter and the pistons during rotation of the plug, and means connecting the head with the casing in such manner as to permit limited rotary adjustment of the head with relation to the casing.

5. In a pump having a casing provided with inlet and outlet ports communicating with circumferential channels, a plug rotatably mounted Within the casing having a plurality of axially extending pumping chambers adapted to successively communicate with the respective channels of the inlet and outlet ports, a plurality of pistons slidably mounted in the said pumping chambers, a head mounted at one end of the casing having axially spaced camways formed therein, a reduced extension formed on the plug and projecting through the said head, the said extensions having a plurality of axially extending slots formed therein, a plurality of studs slidably mounted in the said slots and projecting radially therefrom to engage the said camways, means connecting the inner ends of the pistons with the said studs, and means connecting the head with the casing so as to allow angular adjustment of the head for selectively varying the timing of the piston movements with relation to the inlet and outlet channels of the casing.

RITCHIE K. WILLIAMS. 

